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Science: Excited States
    Wednesday July 18, 2012 1:15pm - 1:45pm @ King Arthur 3rd Floor

    Science: Excited States in Lattice QCD using the Stochastic LapH Method

    Abstract: A new method for computing the mass spectrum of excited baryons and mesons from the temporal correlations of quantum-field operators in quantum chromodynamics is described. The correlations are determined using Markov-chain Monte Carlo estimates of QCD path integrals formulated on an anisotropic space-time lattice. Access to the excited states of interest requires determinations of lower-lying multi-hadron state energies, necessitating the use of multi-hadron operators. Evaluating the correlations of such multi-hadron operators is difficult with standard methods. A new stochastic method of treating the low-lying modes of quark propagation which exploits a new procedure for spatially-smearing quark fields, known as Laplacian Heaviside smearing, makes such calculations possible for the first time. A new operator for studying glueballs, a hypothetical form of matter comprised predominantly of gluons, is also tested, and computing the mixing of this glueball operator with a quark-antiquark operator and multiple two-pion operators is shown to be feasible. 



    Type Science Track
    Session Titles Quantum Methods

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